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Joo Myun PARK1* and Sung Hoi HUH2

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Joo Myun PARK1* and Sung Hoi HUH2 ACTA ICHTHYOLOGICA ET PISCATORIA (2015) 45 (4): 427–431 DOI: 10.3750/AIP2015.45.4.13 LENGTH–WEIGHT RELATIONS FOR 29 DEMERSAL FISHES CAUGHT BY SMALL OTTER TRAWL ON THE SOUTH-EASTERN COAST OF KOREA Joo Myun PARK1* and Sung Hoi HUH2 1Department of Biological Sciences, Macquarie University, Sydney, Australia 2Department of Oceanography, Pukyong National University, Busan, Korea Park J.M., Huh S.H. 2015. Length–weight relations for 29 demersal fi shes caught by small otter trawl on the south-eastern coast of Korea. Acta Ichthyol. Piscat. 45 (4): 427–431. Abstract. We present herewith the relations between total length and weight (LWRs) for 29 fi sh species from the southern coast of the East Sea (=Sea of Japan), Korea: Conger myriaster (Brevoort, 1856); Coilia nasus Temminck et Schlegel, 1846; Engraulis japonicus Temminck et Schlegel, 1846; Clupea pallasii pallasii Valenciennes, 1847; Coelorinchus multispinulosus Katayama, 1942; Lophius litulon (Jordan, 1902); Zeus faber Linnaeus, 1758; Paracentropogon rubripinnis (Temminck et Schlegel, 1843); Lepidotrigla guentheri Hilgendorf, 1879; Liparis tanakae (Gilbert et Burke, 1912); Acropoma japonicum Günther, 1859; Doederleinia berycoides (Hilgendorf, 1879); Jaydia lineata (Temminck et Schlegel, 1842); Ostorhinchus semilineatus (Temminck et Schlegel, 1842); Sillago sihama (Forsskål, 1775); Trachurus japonicus (Temminck et Schlegel, 1844); Pagrus major (Temminck et Schlegel, 1843); Pennahia argentata (Houttuyn, 1782); Zoarces gillii Jordan et Starks, 1905; Callionymus lunatus Temminck et Schlegel, 1845; Callionymus valenciennei Temminck et Schlegel, 1845; Am- blychaeturichthys hexanema (Bleeker, 1853); Amblychaeturichthys sciistius (Jordan et Snyder, 1901); Sphyraena pinguis Günther, 1874; Trichiurus lepturus Linnaeus, 1758; Psenopsis anomala (Temminck et Schlegel, 1844); Pseudorhombus pentophthalmus Günther, 1862; Pseudopleuronectes yokohamae (Günther, 1877); and Cyno- glossus robustus Günther, 1873. The LWRs for 12 species are estimated for the fi rst time and new maximum lengths for six species are reported herewith. All of the relations between total length and weight were signifi cant (all r2 > 0.938). The values of exponent b, estimated using simple linear least squares of log-transformed weight and length data, ranged from 2.730 to 3.440. Keywords: marine fi sh, fi sheries management, East Sea, Sea of Japan, LWR The fi shes examined in the presently reported study habitats and/or regions (Gonçalves et al. 1997). Although were collected off the south-eastern coast of Korea. The LWRs of scorpionfi shes and righteye fl ounders inhabiting study area, in terms of its environmental and geographical south-eastern coast of Korea have been reported (Baeck characteristics, differs generally from other coastal marine et al. 2012, 2014), there are still insuffi cient informa- ecosystems in the east and south seas of Korea (Suh et tion of LWR parameters for Korean fi shes. This study al. 2001). It is a habitat for many commercially important reports LWRs for 29 fi sh species collected by demersal demersal fi sh species and has been renowned for being trawl from the south-eastern coast of Korea: Conger abundant in prey organisms (Kim unpublished**). How- myriaster (Brevoort, 1856); Coilia nasus Temminck et ever, little is known on the ecology of the fi shes living in Schlegel, 1846; Engraulis japonicus Temminck et Schle- the area. gel, 1846; Clupea pallasii pallasii Valenciennes, 1847; Length–weight relation (LWR) parameters (a, b) are Coelorinchus multispinulosus Katayama, 1942; Lophius useful in the assessment of fi sh stocks and populations litulon (Jordan, 1902); Zeus faber Linnaeus, 1758; (Ricker 1968, Froese 2006). LWRs are used to estimate the Paracentropogon rubripinnis (Temminck et Schlegel, mean weight for a given length group and convert length 1843); Lepidotrigla guentheri Hilgendorf, 1879; Liparis observations into weights to provide a measure of biomass tanakae (Gilbert et Burke, 1912); Acropoma japonicum (Froese 2006, Froese et al. 2011). LWRs also allow for life Günther, 1859; Doederleinia berycoides (Hilgendorf, history and morphological comparisons between different 1879); Jaydia lineata (Temminck et Schlegel, 1842); Os- fi sh species or between fi sh populations from different torhinchus semilineatus (Temminck et Schlegel, 1842); * Correspondence: Dr Joo Myun Park, Department of Biological Sciences, Macquarie University, Sydney, NSW 2109, Australia; phone: +61 2 9850 8234; e-mail: (JMP) [email protected] or [email protected], (SHH) [email protected] ** Kim D.J. 1998. [Seasonal variation of species composition of demersal fi sh off Kori.] MSc Thesis, Pukyong National University, Korea. [In Korean.] 428 Park and Huh Sillago sihama (Forsskål, 1775); Trachurus japonicus hama. All of b values were within the expected range of (Temminck et Schlegel, 1844); Pagrus major (Temminck 2.5 to 3.5 (Froese 2006). The mean value of b (± stan- et Schlegel, 1843); Pennahia argentata (Houttuyn, 1782); dard deviation) was 3.117 ± 0.184 indicating a tenden- Zoarces gillii Jordan et Starks, 1905; Callionymus lunatus cy towards positive allometry, which is followed by the Temminck et Schlegel, 1845; Callionymus valenciennei majority of fi sh species (Froese 2006). The LWRs for 12 Temminck et Schlegel, 1845; Amblychaeturichthys of the 29 species determined in the course of the pres- hexanema (Bleeker, 1853); Amblychaeturichthys sciisti- ently reported study are fi rst reports of LWRs for those us (Jordan et Snyder, 1901); Sphyraena pinguis Günther, species. For remaining 17 species, LWRs of 8 species, 1874; Trichiurus lepturus Linnaeus, 1758; Psenopsis Amblychaeturichthys hexanema, Jaydia lineata, Conger anomala (Temminck et Schlegel, 1844); Pseudorhombus myriaster, Engraulis japonicus, Liparis tanakae, Lophi- pentophthalmus Günther, 1862; Pseudopleuronectes us litulon, Pseudopleuronectes yokohamae, and S. siha- yokohamae (Günther, 1877); and Cynoglossus robustus ma have been reported from the Yellow Sea (Xue et al. Günther, 1873. 2011, Wang et al. 2013) and the southern coast of Korea Fish specimens were collected monthly from January (Baeck et al. 2014). The LWRs of 15 species also were to December 2006 off the south-eastern coast of Korea available in FishBase (Froese and Pauly 2015), and 2 (35°15′~35°17′N, 129°18′~129°21′E) from depths be- species, A. hexanema and L. litulon were only listed in tween 30 and 60 m using a small otter trawl. Fish samples the literature (Xue et al. 2011, Wang et al. 2013). were immediately packed with ice and taken to the labora- The seasonal LWRs for 10 of the 29 species are present- tory for measurement of total length (TL) and wet weight ed in Table 2. The parameter b did not differ signifi cant- to the nearest millimetre and gram, respectively. All scien- ly (ANCOVA; P > 0.05) with seasons for Jaydia lineata, tifi c names were verifi ed following FishBase (Froese and Coelorinchus multispinulosus, Lophius litulon, Trachurus Pauly 2015). japonicus, Callionymus lunatus, and Pseudopleuronectes For each species, the weight–length relation was deter- yokohamae, whereas it differed signifi cantly (ANCOVA; mined based on the formula: P < 0.05) for Acropoma japonicum, Clupea pallasii palla- sii, Liparis tanakae, and Pseudorhombus pentophthalmus. W = aLb Lower b values were recorded in winter for C. pallasii pallasii, while A. japonicum in summer and winter, and where W is the wet weight [g], L is total length [cm], P. pentophthalmus were in summer. For L. tanakae, the b and a and b are the intercept and allometric coeffi cient, value was lower in autumn than other seasons. Seasonal respectively. Parameters a and b were estimated using differences in length–weight relations may be due to sea- a simple linear regression analysis of log-transformed sonal difference in the condition and/or sexual maturing data. Extreme outliers were removed before fi tting the of the specimens (Moutopoulos and Stergiou 2002, Froese linear regression (Froese et al. 2011). The 95% confi - 2006). dence intervals (CIs) of parameters a and b and the sta- Our LWR estimates were compared with the Bayesian tistical signifi cance level of r2 were estimated using SYS- estimates of LWRs in fi shes (Froese et al. 2014) and were TAT software (Systat, version 12. SPSS, USA). LWRs found to fall within the ranges expected for each species were summarized over all months. Seasonal LWRs, each or the genus and body shape where they belong. Thus, our spring (March–May), summer (June–August), autumn results represent the reasonable estimates of the LWRs for (September–November), and winter (December–Febru- the 29 species. The estimated parameters of LWRs in this ary), were also estimated for species where more than work should be used with some caution as the length rang- 30 specimens were collected for each season. Analysis es of the specimens available was limited by the selective of covariance (ANCOVA) was used to determine signif- characteristics of fi shing gear used. The majority of the icant differences in the slopes of length–weight regres- samples did not include the full size ranges of specimens sions between seasons. in the study area, especially early juveniles. Petrakis and Length–weight regressions were applied to 16 456 Stergiou (1995) suggested the use of LWRs only for spec- specimens of the 29 species from 24 families. Comparing imens of lengths within the length ranges used in the esti- with information in FishBase (Froese and Pauly 2015), our mation of the parameters. results provide new maximum lengths for 6 species:
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